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An ITV spokesman told Mirror Online: "A youth who attempted to gain access to the London Television Centre, as a prank, at 11pm last night was quickly apprehended by our security team when he triggered an alarm as he climbed an external wall.

"He did not gain access to our studios, which were not in operation at the time."

It happened long after the show had finished - at 8.30pm - and the audience had gone home.